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Table 1 The French Federation of Cancer Center Sarcoma Group grading system

From: Scrotal wall leiomyosarcoma: a case report and review of the literature

  Tumor differentiation Mitotic count Tumor necrosis
Score 0 No necrosis
Score 1 Sarcomas that closely resemble normal adult mesenchymal tissues 0–9 mitoses/10 HPF < 50% tumor necrosis
Score 2 Sarcomas for which histologic typing is certain 10–19 mitoses/10 HPF ≥ 50% tumor necrosis
Score 3 Embryonal and undifferentiated sarcomas, synovial sarcoma, and sarcomas of uncertain differentiation ≥ 20 mitoses/10 HPF
Total score 2 or 3 Grade 1 (low grade)
4 or 5 Grade 2 (intermediate grade)
6, 7, or 8 Grade 3 (high grade)
  1. HPF: high-power field